M42 mount lens for Zenit SLR, Fujica, Pentax, Practica. Great for photo & video on DSLR via adaptors(m42 to Nikon), mirrorless systems: Sony NEX, Olympus Pen, Panasonic G, Canon EOS M, Nikon 1, FujiFilm X-mount etc.
Focal length – 50mm
49mm filter thread
6 diaphragm blades
F/2.8-16 max-min aperture.
0.33m minimum focusing distance.